DE1944364U - LOW VOLTAGE HIGH PERFORMANCE FUSE. - Google Patents

Description

Low-voltage high-performance fuse

The innovation relates to an E'ie.derspannungs high-performance fuse mil; a carbon fiber tape free of reactive substances, that in series with the bottlenecks for the short circuit shutdown with lying between the bottlenecks for the short circuit shutdown strip-shaped overcurrent constrictions are provided, the length of which is a multiple of the bottleneck length for the short-circuit shutdown ".

Yon Mederspannungs high-performance fuses are used in modern Technology that requires the solution of a wide variety of protection tasks. Usually it is a low voltage, high power connection overflow and short-circuit quick. The fuse is in this one Capable of interpretation, even a long-lasting, minor one to withstand overcurrent without signs of aging as well as a short, larger overload, e.g. when starting a three-phase squirrel cage motor. Furthermore, the fuse has the property of limiting and disconnecting the short-circuit current very quickly in the event of a short circuit. These tasks have recently been carried out by low-voltage high-performance fuses also requires the solution of special tasks in the protected area, e.g. the protection of Silicon rectifiers. It is known that silicon rectifiers or, more generally, semiconductor rectifiers against

Hlnwels: This document (description and protection claim) is the last one submitted - it differs from the wording of the originally submitted documents. The legal »Bsdsyturrg of the deviation is not checked · [> le originally submitted documents are in the affairs. -SIs can now be viewed free of charge without any subsequent legal interests . Upon request, Eptokoplsn or Film · legatlve can also be delivered to the usual price. German Patent Office, GebMwefismjJSrtflf · !! ·, La / Ar

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^; las; tung ^^ ßer-neatly sensitive. These rectifiers fine -;., -, can be used for a long time due to slight overcurrents ebehso> \. destroy ^one such as "It by briefly ongoing KurzschlußstrÖBie ^; - insisted: / ^ shalb the task of creating a Fiederspannungs-Hochleistuhgs- ^, ieherung, which allows the rectifier in a very 'Boftöm \ Iiaß- & _/ aiJt.. '&zja;Ö.utz; e2i and still the rectifier flawless; ^{to protect against iffie; iila; s;} fring. Because of the necessary steepness in .-. d.er-'Melt; z.leitl characteristic curve in the area of low overcurrents is% e | _. a 'itlederspannungs high-performance fuse for silicon law _:. ■. richAer ^ ünd \: - d "compare the use of a fuse link ; _: J '~ makes -, "that: · is · free' from the usual reaction substances, Wi . V-" ■ "in scraps of varying inductance and variable resistance '* ::" · -_ ■: greatest possible ^ security at the short circuit shutdown to er-KV. ^J ":.: Zielän / ist-J through the publication SSW 500.221 / 214" leue Sieherungen; j for direct current railways up to 750 volts "known, for larger current;: strengthen the flat fusible conductors in the form of multi-hole conductors" auö ^ - supply ,, whose cross-section at several one behind the other; ./ \. St rush> by :, from ge s te dance rectangles the same amountt gesöhwächl ^ "are to always -Dabei has the rectangle in the middle of a larger Läng & ä ^ ^S'd; ehnung than the other I ^{^;...} /; '

However, these rectangles are parallel to the fusible line axis without; ^: continuous transition from the total fusible link cross-section. - '; zurvEhgatell & sVwas for the short-circuit shutdown even without Bb-V ';Γ;' Interpretation, iat-v-! For a specially desired overcurrent switch-off hä%; ä ^ s- ''.teristics;;is; t 'it is essential, however, to have an appropriate power supply. :: / - ' -density distribution at the transition from the normal cross-section to the - ν

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To reach overcurrent constriction and vice versa. In the case of the This is because a rectangle lying parallel to the fusible line axis occurs when entering the constriction, with a corresponding current congestion effect Τtemperature distribution on »The low-voltage high-performance fuse according to the innovation is characterized in that the recesses have a shape that is more uniform Transition from the narrow point to the full fusible conductor cross-section according to the protection of silicon rectifiers in particular decisive fuse characteristic results. This creates a smooth transition from the narrow point to the full fusible conductor cross-section achieved. The fusible link is particularly advantageous banä made of pure silver. To the desired slope to get the overcurrent shutdown becomes the bottleneck for the overcurrent shutdown at least six times as long as wide and made strong.

Exemplary embodiments of the firing are based on the drawing explained and the mode of operation described.

Fig. 1 shows a current timing diagram in which with a solid Line the limit load characteristic 1 for a semiconductor rectifier is drawn. With a dash-dotted characteristic curve 2 is that of a normal, overcurrent-carrying and short-circuit quick Fuse shown. Finally, the dashed line 3 shows the characteristics of a fuse accordingly of the present innovation. It can be clearly seen that the switch-off characteristic of the fuse in all areas is below the overload limit characteristic for the rectifier lies.

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The I ¹ Ig. 2 and 3 show a side and elevation view of a fusible conductor 4j which is rolled in a tubular shape with its bent ends 5 attached to the cover plates 6 and the blade contacts 7 by welding strip-shaped overcurrent constrictions 9 cut by punching, which in the illustrated embodiment are kinked in order to shorten the fusible link.

The 5 ¹ Ig. 4 shows a fusible link for a higher voltage, in which two bottlenecks for the short-circuit disconnection 8 are connected in series in series with the overcurrent constrictions 9 on both sides. The ends 5 to be bent are obtained by punching cuts.

Due to the design of the fuse element shown, it is possible to with the same punching cut or with the same punching tool by exchanging punching dies for different fusible links Establish nominal voltages. By doubling the bottlenecks For the short-circuit shutdown, the nominal operating voltage of e.g. 500 V for a fusible strip according to Pig. 2 and 3, to 800 V for a Pig fusible link. 4 increase.

4 claims for protection
4 figures

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Claims (4)

Protection claims 1. High-performance median voltage fuse with one of leakage materials free fusible tape that is connected in series to the narrow for the short-circuit shutdown with between the bottlenecks for the short circuit breaker lying strip-shaped overcurrent constrictions is provided, the length of which is a multiple of the bottleneck length for the short-circuit disconnection, characterized in that, that the recesses have a shape that see a smooth transition from the Ingstelle (9) to the full fusible conductor cross section according to the characteristic fuse curve (3), which is decisive in particular for the protection of silicon rectifiers. 2. Fuse according to claim 1, characterized in that the Fusible tape (4) is made of pure silver. 3. Fuse according to claim 1 and 2, characterized in that the overcurrent constriction (9) is at least six times as long as it is wide and is strong. 4. Fuse according to claim 1 to 3, characterized in that the fusible strip (4) is attached in a rolled tubular shape between the contact parts (7) of the fuses. - 5 - La / Ar